If it isn't the printers hostname then it must be the SMTP server hostname, check that it is valid, and if it is, look to your time(has to be within 3 minutes) and DNS (Try 8.8.8.8) or switch the ther SMTP servers IP address instead.
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If it isn't the printers hostname then it must be the SMTP server hostname, check that it is valid, and if it is, look to your time(has to be within 3 minutes) and DNS (Try 8.8.8.8) or switch the ther SMTP servers IP address instead.